Thanks for that Selene. No one can tell you or K what the right thing is to do or how to handle this. The only thing that will ever work is whatever works for you.
I really hope all goes well with the family and that they are as supportive as they can be. Just remember, this is a shock to them as well. It takes time to process and in the meanwhile, stupid, apparently unfeeling things can be said. Those things aren't meant to hurt, but they do anyway. Please, you and K need to be as prepared as you can be on such short notice and you must keep your heads together.
I wish you both the best.
PS: I love your ps - bring it on!